So, I'm not sure if anyone really still uses this site since Glee ended a long time ago, but I have been driving my self crazy trying to find a specific story. All I remember is, that it was a re write of season one (i think) and when Kurt tried out for New Directions he was rejected. All the other original members are accepted though. I'm not sure if they're mean to him about it. I remember them telling Sam I think that Kurt can't sing, but I, might be mixing stories.
I know that Kurt starts his own Glee club, coached by Emma and I think it was full of Cheerios. I know they competed against New Directions and won. I also know that at some point in the story Kurt confronts Rachel and she said the reason Kurt was rejected was because she told Mr. Schue that if he accepted Kurt she wouldn't join. It's not Rachel or Will friendly. Not sure if there was a pairing. I also don't remember where it was posted.
Revenge is a Dish Best Served to Music
Fanfiction Link (https://www.fanfiction.net/s/8468709/1/Revenge-is-a-dish-best-served-to-music)
Ao3 Link (http://archiveofourown.org/works/715494)